Add a test to demonstrate issue 13 is not an issue

[aerorahul]

Description This PR:

• adds a test to demonstrate the stderr file is not binary by reading the contents and printing them

Fixes #13

Type of change

• [X] New feature (non-breaking change which adds functionality) Adds a test.

How Has This Been Tested?

• [X] pynorms
• [X] pytests

Checklist

• [ ] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] My changes need updates to the documentation. I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] New and existing tests pass with my changes
• [ ] Any dependent changes have been merged and published

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 50.88%. Comparing base (942b90b) to head (6ff9b2f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #20 +/- ## ======================================== Coverage 50.88% 50.88% ======================================== Files 16 16 Lines 1476 1476 Branches 313 313 ======================================== Hits 751 751 Misses 669 669 Partials 56 56 ```

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